US4455336A - Ceramic honeycomb structural bodies - Google Patents

Ceramic honeycomb structural bodies Download PDF

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US4455336A
US4455336A US06446512 US44651282A US4455336A US 4455336 A US4455336 A US 4455336A US 06446512 US06446512 US 06446512 US 44651282 A US44651282 A US 44651282A US 4455336 A US4455336 A US 4455336A
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outer peripheral
honeycomb structural
ceramic honeycomb
longitudinal
portion
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US06446512
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Yutaka Ogawa
Seiichi Asami
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NGK Insulators Ltd
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NGK Insulators Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006Honeycomb structures
    • C04B38/0009Honeycomb structures characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2407Filter candles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/02Solids
    • B01J35/04Foraminous structures, sieves, grids, honeycombs
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5024Silicates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81Coating or impregnation
    • C04B41/85Coating or impregnation with inorganic materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28Construction of catalytic reactors
    • F01N3/2803Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2825Ceramics
    • F01N3/2828Ceramic multi-channel monoliths, e.g. honeycombs
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00241Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00413Materials having an inhomogeneous concentration of ingredients or irregular properties in different layers
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0081Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00Structure of catalyst support or particle filter
    • F01N2330/06Ceramic, e.g. monoliths
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24149Honeycomb-like
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24744Longitudinal or transverse tubular cavity or cell

Abstract

A ceramic honeycomb structural body having a high strength wherein the outer peripheral portion including an outer peripheral wall or a part extending from the end surface of the honeycomb body has a smaller porosity than the other portion. Such a ceramic honeycomb structural body is produced by filling pores in the above defined portion of the honeycomb body with a ceramic material having a smaller porosity than the ceramic honeycomb body material.

Description

This is a continuation of Ser. No. 240,501 filed Mar. 4, 1981 and now abandoned.

The present invention relates to ceramic honeycomb structural bodies to be used for, e.g., a catalyst support for purifying exhaust gases of an internal combustion engine, as well as many other uses.

In general, ceramic honeycomb bodies have a surface area per unit volume, are excellent in heat resistance, and are used for, e.g., a catalyst support for purifying exhaust gas in an internal combustion engine as well as many other uses. It is desirable, for the purpose of improving the function of the honeycomb body, that partition walls defining the channels of the honeycomb body are thinner and larger in the porosity. However, when the partition walls are thinner and the porosity is increased, the mechanical strength of the honeycomb body itself is lowered. When a honeycomb body is practically used, said body is put in a holder and set in an equipment, for example an internal combustion engine system, and the body is apt to be chipped off. Another practical problem is that when a clamping pressure of the holder for preventing vibration is increased, the honeycomb body is apt to be cracked.

To prevent these drawbacks, the following methods have been proposed:

(1) Coating of a glaze only on an outer peripheral wall surface of a honeycomb body (Japanese Utility Model Laid Open Application No. 133,860/78);

(2) Coating of heat resistant glass ceramic powders only on an outer peripheral wall (Japanese Utility Model Application Publication No. 34,373/78); and

(3) Thickening the outer peripheral wall of a ceramic honeycomb body by integrally extruding method (Japanese Patent Laid Open Application No. 88,908/74).

However, these proposals can not expect the satisfactory improvement of the strength of the honeycomb body.

A goal of the present invention is to remove these defects and this is accomplished by making ceramic honeycomb bodies wherein the porosity of the partition walls of channels of the honeycomb body at the outer peripheral portion, including the outer peripheral wall, is smaller than that of the other portion.

The low strength of the porous ceramic honeycomb body is due to the fact that the portion occupied by pores in the partition walls forming the channels is large while the portion contributing to substantially developing the strength is small, and at the portions where the pores are exposed at the partition wall as shown in FIG. 1, the external stress is locally concentrated. Accordingly, it can be expected that the strength of the ceramic honeycomb body is improved by filling the pores in the partition wall with a material having a smaller porosity to make the partition wall surface flat.

In order to prevent the honeycomb body from slippage caused by vibration, both ends of the body are generally clamped between two flanges which are projected inwardly in a holding vessel from the inner surface thereof, when the honeycomb body is held in the holding vessel. In this case, the flow channels extend inwardly several millimeters from the outer periphery of the honeycomb body and are closed by the flange. These slow channels do not allow for the passage of a fluid flow.

In the present invention, the porosity of the partition wall of the channels at the above described portion which do not permit fluid flow are reduced to strengthen the honeycomb body. Unless the portion wherein the pores are to be filled with a material having a lower porosity includes the partition walls of channels at the inside of the outer periphery as well as the outer peripheral wall, a satisfactory improvement of the strength can not be obtained. However, if one wishes to prevent chipping off mainly at the end corner portions, even if the honeycomb body is not treated along the total length in the longitudinal direction of the channels, this effect can be attained by treating the partition wall to a given depth from the end portion as shown in FIG. 3.

The coating materials are preferably ceramic materials, which have a lower porosity than that of the raw material of the honeycomb body and contain a small amount of flux component in order to tightly fit to the inner portion of pores and the partition wall.

The present invention will now be explained in greater detail.

For better understanding the invention, reference is taken to the accompanying drawings, wherein:

FIGS. 1(A) and (B) show the fragmentary cross-sectional views of a part of the partition wall of a ceramic honeycomb body before and after the coating treatment is carried out respectively;

FIG. 2(A) is a vertical cross-sectional view of a honeycomb structural body wherein the partition walls at the outer peripheral portion are treated according to the present invention along the entire length of the channels;

FIG. 2(B) is a cross-sectional view taken along the line B--B in FIG. 2(A);

FIG. 3(A) is a vertical cross-sectional view of a honeycomb structural body wherein a part of the partition wall extending from the opening ends is treated; and

FIG. 3(B) is a cross-sectional view taken along the line B--B in FIG. 3(A).

In FIG. 1, the numerals 1, 2 and 3 represent the ceramic honeycomb body material, open pore portion and coating material filled in the open pore portion of partition wall of ceramic honeycomb body, respectively. In FIGS. 2 and 3, the numerals 4, 5 and 6 respectively represent the channels extending therethrough, the low porosity partition wall treated with coating material and the partition wall without the coating.

The following examples are given for the purpose of illustration of this invention and are not intended as limitations thereof.

EXAMPLE 1

As a ceramic honeycomb body to be reinforced, use was made of a fired cordierite ceramic honeycomb body having an outer diameter of 90 mm, a length of 110 mm, a thickness partition wall thickness of 0.3 mm, an outer peripheral wall thickness of 0.3 mm and channel number per 1 inch2 being about 300.

The reinforcing materials were prepared by adding to 100 parts by weight of each of three powdery compositions A, B and C having Seger formula as shown in the following table, 35-45 parts by weight of water and 2 parts by weight of a binder of carboxymethylcellulose to form slurries.

______________________________________                     Grain sizeSeger formula (molar ratio)                     ofKNaO      Cao    MgO     Al.sub.2 O.sub.3                           SiO.sub.2                                 mixed batch______________________________________A    0.22     0.05   0.73  0.86   4.91  -200 meshB    0.16     0.04   0.80  0.92   4.33  -200 meshC    0.10     0.03   0.87  0.93   3.13  -200 mesh______________________________________

Two types of honeycomb body samples were prepared as follows. In one sample type of honeycomb body, the part which is not to be treated with the slurry was masked and the entire honeycomb body was dipped in the slurry. In another type sample of honeycomb body, only 10 mm of both ends of the peripheral channels were dipped in the slurry. Before these two dipped samples were dried, the superfluous slurry was scattered and removed with compressed air and the slurry protruded on the outer peripheral wall was wiped off. The reason why the outer peripheral wall is wiped off is that if the coated layer remained on the outer peripheral wall, the outer diameter size would be varied. Thereafter, water is dried and removed and the thus treated honeycomb structural body was fired at 1370°-1400° C. for 12 hours by an oxidizing condition. For comparison, a honeycomb structural body, only the outer peripheral wall surface of which is coated with the slurry, was prepared.

The reinforcing effect was estimated in the following manner. The impact breaking energy of the treated portion was determined by Chalpy Impact Tester and the compression strength was determined by using a jig matched to the outer peripheral shape of the honeycomb structural body by means of a universal testing machine. The obtained results are shown in the following Table 1. Furthermore, the treated portion was cut off and the cut portion was measured with respect to the properties of the partition wall and are shown in the following Table 2.

              TABLE 1______________________________________(average value of five samples)             Treating material                                  Not    Coated portion               A      B      C    treated______________________________________Impact breaking      Outer peripheral                   4.5    4.3  3.7  1.5energy (kg · cm)      wall and entire      length      Outer peripheral      wall and 10 mm      depth      Outer peripheral                   2.3    2.3  2.0      wallCompression      Outer peripheral                   3130   3050 2780breaking load      wall and entire(kg)       length      Outer peripheral                   2070   2050 2000 1660      wall and 10 mm      depth      Outer peripheral                   2010   1990 1980      wall______________________________________

              TABLE 2______________________________________      Treating material                               Not      A      B        C        treated______________________________________Porosity     25.0     27.4     31.0   37.0(vol %)Flexural strength        210      180      170    50(kg/cm.sup.2)Thermal expansion        1.9      1.8      1.6    1.0coefficient(×10.sup.-6 /°C.)Softening    1150     1210     1280   1410temperature(°C.)______________________________________

As seen from the above example, the ceramic honeycomb structural bodies obtained according to the present invention, in which the inner walls of the channels have also been treated with the slurry, have an impact breaking energy maximum which is about 3 times as high as the honeycomb body not treated with the slurry and about 2 times as high as the honeycomb body in which only the outer peripheral wall surface has been treated. Furthermore, with respect to compression strength, the honeycomb structural bodies wherein the outer peripheral wall surface and the entire length of the channels were treated, had a maximum about 1.9 times as high as the honeycomb body not treated and about 1.5 times as high as the honeycomb body wherein only the outer peripheral wall surface has been treated. As seen from Table 2, the properties are slightly different depending upon the applying composition, but said composition may be selected considering the other performance required in the ceramic honeycomb body, for example the softening temperature and the like.

Thus, the ceramic honeycomb structural bodies obtained according to the present invention are not broken even if the clamping pressure is increased when said body is held by a holding vessel. The result is that even when the honeycomb structural bodies are vibrated in a metal vessel and strike the inner wall of the vessel, said bodies are rarely broken. The prevention of chipping off at the end portions of the honeycomb body due to vibration can be attained by reinforcing the vicinity of both end portions where cracking is readily caused.

Claims (3)

What is claimed is:
1. A ceramic honeycomb structural body, comprising:
an outer peripheral portion which comprises an outer peripheral wall and longitudinal channels formed by longitudinal porous walls, the longitudinal porous walls having transverse cross-sections; and
a central portion contiguous with the outer peripheral portion, and having longitudinal channels formed by longitudinal porous walls, the longitudinal porous walls of said central portion being transversely more porous than the transverse portion of longitudinal porous walls of said outer peripheral portion, the longitudinal channels of said outer peripheral portion being open.
2. The ceramic honeycomb structural body, as claimed in claim 1, wherein the decreased transverse porosity walls of said outer peripheral portion extends only partially along the longitudinal porous walls from an end surface of the honeycomb structural body.
3. The ceramic honeycomb structural body as claimed in claim 1, wherein a plurality of pores located in the longitudinal porous walls of the outer peripheral portion are transversely filled with a material having a smaller porosity than that of the material of the honeycomb structural body.
US06446512 1980-03-14 1982-12-03 Ceramic honeycomb structural bodies Expired - Lifetime US4455336A (en)

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JP55-32232 1980-03-14
JP3223280A JPS626855B2 (en) 1980-03-14 1980-03-14

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US4645700A (en) * 1983-10-07 1987-02-24 Ngk Insulators, Ltd. Ceramic honeycomb structural body
US4675241A (en) * 1984-10-25 1987-06-23 Hexcel Corporation Honeycomb part with densified outer periphery
US4758253A (en) * 1986-02-24 1988-07-19 Imperial Chemical Industries Plc Adsorption process
US4833115A (en) * 1986-09-19 1989-05-23 Dr. C. Otto Feuerfest Gmbh Ceramic honeycombed elongated catalyst carrier and method for production of same
US4840827A (en) * 1987-03-16 1989-06-20 Ngk Insulators, Ltd. Ceramic honeycomb structural bodies and method of producing the same
US4985291A (en) * 1983-02-16 1991-01-15 Matsushita Electric Industrial Co., Ltd. Burner skeleton
US5043311A (en) * 1989-04-20 1991-08-27 Degussa Aktiengesellschaft Monolithic or honeycomb-type catalyst
US5629067A (en) * 1992-01-30 1997-05-13 Ngk Insulators, Ltd. Ceramic honeycomb structure with grooves and outer coating, process of producing the same, and coating material used in the honeycomb structure
EP0965735A2 (en) * 1998-06-18 1999-12-22 Ngk Insulators, Ltd. Thin-walled honeycomb structure and method for reinforcing the same
US6242072B1 (en) 1998-06-03 2001-06-05 Denso Corporation Honeycomb structural body and process for production of the same
US6596372B2 (en) 1999-12-07 2003-07-22 Denso Corporation Ceramic honeycomb structural body and methods of preparing the same
BE1014386A3 (en) * 1998-01-22 2003-10-07 Denso Corp Structure ceramic honeycomb and die extrusion.
US20040152593A1 (en) * 2003-01-30 2004-08-05 Cutler Willard A. Catalyst support
EP1450458A1 (en) * 2003-02-21 2004-08-25 Felten & Guilleaume AG Absorbing-element assembly for Switchgear
US20040177600A1 (en) * 2003-03-10 2004-09-16 Ngk Insulators, Ltd. Honeycomb structure
US6821492B1 (en) * 2000-09-13 2004-11-23 Delphi Technologies, Inc. Stronger catalyst using selective washcoat location
EP1486255A1 (en) * 2002-03-20 2004-12-15 Ngk Insulators, Ltd. Method of protecting indicated information and cellular structure having its surface information protected by the protecting method
US20050102987A1 (en) * 2002-03-29 2005-05-19 Ibiden Co. Ltd Ceramic filter and exhaust gas decontamination unit
US20050106083A1 (en) * 2002-03-15 2005-05-19 Ngk Insulators, Ltd Ceramic honeycomb structural body and method of manufacturing the structural body
EP1543876A1 (en) * 2002-09-25 2005-06-22 Ngk Insulators, Ltd. Honeycomb catalyst carrier and method for production thereof
US20050147791A1 (en) * 2003-12-29 2005-07-07 Gulati Suresh T. High-strength thin-walled honeycombs
US20070054803A1 (en) * 2005-08-31 2007-03-08 Ngk Insulators, Ltd. Honeycomb structure and honeycomb catalytic body
US20080124517A1 (en) * 2006-11-29 2008-05-29 Douglas Munroe Beall Wall-flow honeycomb filter with hexagonal channel symmetry
US7468202B2 (en) 2002-05-30 2008-12-23 Ngk Insulators, Ltd. Honeycomb structural body
US20090022942A1 (en) * 2006-02-10 2009-01-22 Ngk Insulators, Ltd. Honeycomb segment, honeycomb structure and process for producing the same
US20100154370A1 (en) * 2008-12-22 2010-06-24 Caterpillar Inc, System and methods for particulate filter
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JP2604876B2 (en) * 1990-03-27 1997-04-30 日本碍子株式会社 Method for producing a ceramic honeycomb structure
JP3417015B2 (en) * 1993-11-26 2003-06-16 東陶機器株式会社 Porous member and a manufacturing method thereof
US5773103A (en) * 1995-07-31 1998-06-30 Media And Process Technology Inc. Inorganic membranes using porous cordierite support
US6713429B1 (en) * 1998-12-21 2004-03-30 Denso Corporation Purification catalyst for internal combustion engine exhaust gas
JP2001226173A (en) * 1999-12-07 2001-08-21 Denso Corp Manufacturing process of honeycomb structure
DE10024038A1 (en) * 2000-05-13 2001-11-22 Dmc2 Degussa Metals Catalysts A honeycomb body of a ceramic material with improved radial pressure resistance
JP4504660B2 (en) 2003-11-13 2010-07-14 日本碍子株式会社 Ceramic honeycomb structure
EP1813339B1 (en) * 2006-01-27 2013-03-06 Ibiden Co., Ltd. Honeycomb structure and method for manufacturing honeycomb structure
EP2024299A2 (en) * 2006-05-31 2009-02-18 Corning Incorporated Crack-resistant ceramic honeycomb articles and methods of manufacturing same
DE102008004036B3 (en) * 2008-01-11 2009-07-09 Audi Ag Producing honeycomb structure body for a catalyst of a motor vehicle, comprises forming a honeycomb structure body having fluid channels with an outer skin surrounding a honeycomb area as an external circumference wall
JP5096978B2 (en) * 2008-03-27 2012-12-12 日本碍子株式会社 The honeycomb catalyst body
JP5419505B2 (en) * 2009-03-24 2014-02-19 日本碍子株式会社 Manufacturing method of preparation and the honeycomb catalyst body of the honeycomb structure
JP6312481B2 (en) * 2014-03-24 2018-04-18 日本碍子株式会社 Honeycomb structure

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Also Published As

Publication number Publication date Type
DE3109295A1 (en) 1981-12-24 application
DE3109295C2 (en) 1982-11-04 grant
GB2071639B (en) 1983-12-14 grant
JPS626855B2 (en) 1987-02-13 grant
GB2071639A (en) 1981-09-23 application
JPS56129043A (en) 1981-10-08 application

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